avoid dependency on /usr/bin/python33
    
    The custom patch + find/sed stepped on each other's toes so we ended up with
    weird shebangs like /usr/bin/python33 and even /usr/bin/python333 so the
    generated RPM required /usr/bin/python33 (which is not available in Fedora).
    
    Instead just use pathfix.py which does the job without having to update
    patch files manually for each release.